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Stainless Steel - Properties and Applications of Grades 310/310s Stainless Steel by Austral Wright Metals

Topics Covered

Background
Introduction
Applications of Grade 310/310S Stainless Steel
Properties of Grade 310/310S Stainless Steel
Chemcial Composition of Grade 310/310S Stainless Steel
Mechanical Properties of Grade 310/310S Stainless Steel
Physical Properties of Ferritic Stainless Steel
Fabrication of Grade 310/310S Stainless Steel
Machinability of Grade 310/310S Stainless Steel
Welding of Grade 310/310S Stainless Steel
Heat Treatment of Grade 310/310S Stainless Steel
Heat Resistance of Grade 310/310S Stainless Steel
Available Forms of Grade 310/310S Stainless Steel

Background

Austral Wright Metals - part of the Crane Group of Companies, is the result of the merger of two long established and well respected Australian owned metal distribution companies. Austral Bronze Crane Copper Ltd and Wright and Company Pty Ltd.

This merger has bought together Australia's leaders in the distribution of:

  • Aluminium - Coil, sheet, plate, tread plate etc
  • Copper, brass, bronze - Sheet, coil, extrusions and tube
  • Nickel and High Performance Alloys - Hollow and bar, sheet, plate in alloys such as Incoloy, Inconel and Monel
  • Stainless steel - sheet, coil, plate, flat, angle, round, tube, fittings, consumables
  • High Performance Materials including, titanium, duplex alloys, cobalt alloys, copper nickels, welding consumables and other high technology metals.

Introduction

Grade 310 is a medium carbon austenitic stainless steel, for high temperature applications such as furnace parts and heat treatment equipment. It is used at temperatures up to 1150°C in continuous service, and 1035°C in intermittent service. Grade 310S is a low carbon version of grade 310.

Applications of Grade 310/310S Stainless Steel

Typical Applications Grade 310/310S is used in fluidised bed combustors, kilns, radiant tubes, tube hangers for petroleum refining and steam boilers, coal gasifier internal components, lead pots, thermowells, refractory anchor bolts, burners and combustion chambers, retorts, muffles, annealing covers, saggers, food processing equipment, cryogenic structures.

Properties of Grade 310/310S Stainless Steel

These grades contain 25% chromium and 20% nickel, making them highly resistant to oxidation and corrosion. Grade 310S is a lower carbon version, less prone to embrittlement and sensitisation in service. The high chromium and medium nickel content make these steels capable for applications in reducing sulphur atmospheres containing H2S. They are widely used in moderately carburising atmospheres, as encountered in petrochemical environments. For more severe carburising atmospheres other heat resisting alloys should be selected. Grade 310 is not recommended for frequent liquid quenching as it suffers from thermal shock. The grade is often used in cryogenic applications, due to its toughness and low magnetic permeability.

In common with other austenitic stainless steels, these grades cannot be hardened by heat treatment. They can be hardened by cold work, but this is rarely practiced.

Chemcial Composition of Grade 310/310S Stainless Steel

The chemical composition of grade 310 and grade 310S stainless steel are summarised in the following table.

Table 1. Chemical composition % of grade 310 and 310S stainless steel

Chemical Composition

310

310S

Carbon

0.25 max

0.08 max

Manganese

2.00 max

2.00 max

Silicon

1.50 max

1.50 max

Phosphorus

0.045 max

0.045 max

Sulphur

0.030 max

0.030 max

Chromium

24.00 - 26.00

24.00 - 26.00

Nickel

19.00 - 22.00

19.00 - 22.00



Mechanical Properties of Grade 310/310S Stainless Steel

The mechanical properties of grade 310 and grade 310S stainless steel are summarised in the following table.

Table 2. Mechanical properties of of grade 310/310S stainless steel

Mechanical Properties

310/ 310S

Grade 0.2 % Proof Stress MPa (min)

205

Tensile Strength MPa (min)

520

Elongation % (min)

40

Hardness (HV) (max)

225



Physical Properties of Ferritic Stainless Steel

The physical properties of grade 310 and grade 310S stainless steel are summarised in the following table.

Table 3. Physical properties of grade 310/310S stainless steel

Properties

at

Value

Unit

Density

 

8,000

Kg/m3

Electrical Conductivity

25°C

1.25

%IACS

Electrical Resistivity

25°C

0.78

Micro ohm.m

Modulus of Elasticity

20°C

200

GPa

Shear Modulus

20°C

77

GPa

Poisson's Ratio

20°C

0.30

 

Melting Rnage

 

1400-1450

°C

Specific Heat

 

500

J/kg.°C

Relative Magnetic Permeability

 

1.02

 

Thermal Conductivity

100°C

14.2

W/m.°C

Coefficient of Expansion

0-100°C

15.9

/°C

 

0-315°C

16.2

/°C

 

0-540°C

17.0

/°C



Fabrication of Grade 310/310S Stainless Steel

Fabrication Grades 310/310S are forged in the temperature range 975 - 1175°C. Heavy work is carried out down to 1050°Cand a light finish is applied to the bottom of the range. After forging annealing is recommended to relieve all stresses from the forging process. The alloys can be readily cold formed by standard methods and equipment.

Machinability of Grade 310/310S Stainless Steel

Machinability Grades 310/310SS are similar in machinability to type 304. Work hardening can be a problem and it is normal to remove the work hardened layer by using slow speeds and heavy cuts, with sharp tools and good lubrication. Powerful machines and heavy, rigid tools are used.

Welding of Grade 310/310S Stainless Steel

Welding Grades 310/310S are welded with matching electrodes and filler metals. The alloys are readily welded by SMAW (manual), GMAW (MIG), GTAW (TIG) and SAW. Electrodes to AWS A5.4 E310-XX and A 5.22 E310T-X, and filler metal AWS A5.9 ER310 are used. Argon is shielding gas. Preheat and post heat are not required, but for corrosion service in liquids full post weld solution annealing treatment is essential. Pickling and passivation of the surface to remove high temperature oxides are essential to restore full aqueous corrosion resistance after welding. This treatment is not required for high temperature service, but welding slag should be thoroughly removed.

Heat Treatment of Grade 310/310S Stainless Steel

Heat Treatment Type 310/310S are solution annealed by heating to temperature range 1040 -1065°C, holding at temperature until thoroughly soaked, then water quenching.

Heat Resistance of Grade 310/310S Stainless Steel

Grades 310/310S have good resistance to oxidation in intermittent service in air up to 1035°Cand 1050°Cin continuous service. The grades are resistant to oxidation, sulphidation and carburisation.

Available Forms of Grade 310/310S Stainless Steel

Austral Wright Metals can supply these grades as plate, sheet and strip, bar and rod, seamless tube and pipe, welded tube and pipe, forgings and forging billet, tube and pipe fittings, wire. Corrosion Resistance Grade 310/310S is generally not used for corrosive liquid service, although the high chromium and nickel content give corrosion resistance superior to grade 304. The alloy does not contain molybdenum, so pitting resistance is quite poor. Grade 310/310S will be sensitised to intergranular corrosion after service at temperatures in range 550 - 800°C. Chloride stress corrosion cracking may take place in corrosive liquids containing chlorides at temperatures exceeding 100°C.

For more information on this source please visit Austral Wright Metals

 

 

Date Added: Sep 7, 2008 | Updated: Jun 11, 2013
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